The Serbian star understands the difficulties facing his younger sibling but has backed him to succeed.

"He has to face this pressure in a way for having the Djokovic surname," he said.

"All over the world where he plays tennis, I guess he has to face this pressure that is not necessary for him at this age.

"It's his burden, and he's very committed. He wants to succeed in tennis. But everybody obviously has a different path. We have a younger brother who is 16 years old who is coming up, so hopefully they can become world-class players."